Cookies on the
How CashForDiamonds website

We use cookies to ensure that we give you the best experience on our website. We also use cookies to ensure we show you advertising that is relevant to you. If you continue without changing your settings, we'll assume that you are happy to receive all cookies on the HowCashForDiamonds website. However, if you would like to, you can change your cookie settings at any time.

Sell diamonds for cash UK, sell diamond ring, jewellery, engagement ring, scrap diamonds, we buy diamonds,

Call now on 020 ­8446 8538
or email us at


How to sell a diamond

How to assess the carat weight of your Diamond?

Diamonds are measured in terms of weight, not size but the chart below will give you a very good indication. The heavier the diamond, the greater the carat weight. Two diamonds of equal weight can have very different values, because the quality is still determined by the colour, clarity and cut.  As diamonds increase in size, their cost tends to increase exponentially rather than arithmetically. Thus, a one-carat diamond can cost significantly more than a one-half carat diamond of equal quality.  The weight of a diamond less than one carat in size may also be described in terms of "points".  There are 100 "points" in 1 carat.

sell diamonds, how to sell a diamond, buy diamonds, sell diamond ring, wedding ring, engagement ring

How to assess the colour of your diamond?


While many diamonds appear colourless, or white, they may actually have subtle yellow or brown tones that can be detected when comparing diamonds side by side. Colourless diamonds are the rarest and most valuable of all. Colour variations are a result of the natural forces (i.e., temperature, pressure, trace elements) at work during the formation of diamonds within the Earth. Because subtle colour variations dramatically affect the value of a diamond, a colour grading scale is used to categorise the shading differences from one diamond to the next.

Diamonds are graded according to the GIA (Gemological Institute of America) colour chart.

sell diamonds, diamonds to sell, how to sell a diamond, buy diamonds, sell diamond ring, wedding ring, engagement ring

GIA colour grade





Stone looks absolutely clear, with no hint of colour to the eye in colour grading or mounted




Near Colourless

Some colour tint is visible during grading. Mounted in a setting, stone appears colourless.  G-H-I colour diamonds are considered very nice diamonds for fine jewellery.





Faint yellow

Yellow or greyish tint is obvious during colour grading. Mounted, this stone still shows a tint of colour




Light yellow

Obvious yellow or greyish colour



Bright, remarkable colour - usually blue, pink, yellow

How to assess the clarity of your diamond?

Clarity is an indication of a diamond's purity. Clarity is determined by a diamond's naturally occurring internal characteristics. These characteristics are sometimes not visible to the naked eye and they are what make each diamond unique. The characteristics, or inclusions, may look like crystals, feathers, clouds or dark spots and the quantity, size, and location of these inclusions does have an affect on a diamond's value. Diamonds with fewer and smaller inclusions generally are more brilliant, assuming that the colour and cut are the same. 

The U.S. Federal Trade Commission has established the jewellery industry's standards for diamond clarity based on 10-power magnification. A diamond is graded by its relative departure from "flawless"--the complete absence of inclusions under 10 x magnification. Less than 1% of all diamonds ever found have had no inclusions and can be called flawless (FL) or internally flawless (IF).  VVS diamonds are also extremely rare.  VS diamonds are of superior quality and are used in extremely fine jewellery. This clarity grade becomes more important as the diamond size increases.  A large percentage of jewellery is made with SI quality diamonds. These diamonds are perfect for diamond studs or multi-stone diamond earrings, rings and bracelets or as accents in gemstone rings.  I quality diamonds are acceptable as well for diamond jewellery or as accents but the sparkle is reduced by the number and location of inclusions. 

sell diamonds, how to sell a diamond, selling diamond rings, scrap diamonds, buy diamonds, sell diamond ring, wedding ring, engagement ring


Clarity Grade





Clear stone, free of all flaws, even under 10x magnification


Internally Flawless

No inclusions visible at 10x magnification


Very Very Slight Inclusion #1

Tiny inclusions are extremely difficult to find, even under 10x magnification


Very Very Slight Inclusion #2

Tiny inclusions are very difficult to find, even under 10x magnification


Very Slight Inclusion #1

Minor inclusions are difficult to see under 10 x magnification


Very Slight Inclusion #2

Minor inclusions are somewhat difficult to find under 10x magnification


Slight Inclusion #1

Inclusions are easy to see under 10x magnification. These diamonds are considered "eye clean" since inclusions can not been seen with the naked eye. In larger diamonds very very small inclusions may be visible and still be classified as SI1.


Slight Inclusion #2

Inclusions and/or blemishes are easy to see at 10x.  These diamonds are considered "eye clean" since inclusions can not been seen with the naked eye. In larger diamonds very small inclusions may be visible and still be classified as SI2.


Included #1

Inclusions and/or blemishes are obvious and rather easy to see without magnification.


Included #2

Inclusions and/or blemishes are obvious and easy to see without magnification


Included #3

Inclusions and blemishes that are obvious to the unaided eye

How to work out the price of your gold and platinum in your diamond jewellery?

Please visit our website and use our price calculator to determine the value of your gold. We offer the highest online rate for you to sell gold to us at How Cash For Gold.

You can contact us on 0208 446 8538 or apply online on our website for a FREE Gold pack.

How to send us your diamonds or diamond jewellery if you live outside the UK?

1. Fill in and print our online application form, with all the exact details that you have on your diamond/diamonds.

2. Keep one copy for yourself, and place the other copy into a packet with the goods that you are sending to us.

3. Once the above is done, you have 2 options.

(a) You can send your goods to us at HCFD, 48B HENDON LANE, FINCHLEY, LONDON N3 1TT, ENGLAND by insured special delivery from your local post office.


(b) You can send them to us by FedEx, or TNT, free of charge. Once we have seen your

Email, and we know what you are sending to us, we will organise your goods to be collected from your home or work place, whichever you prefer. Also you will be able to track your parcel online with the TNT or FEDEX tracking ID.

4. The moment your goods have arrived with us, we will notify you by phone or email, whichever you prefer.

5. We will then weigh, test for colour and purity, and value your diamond/diamonds, with our sophisticated diamond equipment, and by our very experienced GIA member staff. Once we have done our rigorous tests, we will contact you by phone or email to give you a firm offer, and hopefully our figure will agree with the original price that you got from our unique Online Diamond Calculator.

6. If you hopefully have accepted our offer, we will do an automatic International free bank transfer, to wherever you would like. Once we have your bank details, we will need proof of address to transfer the money on the same day that we have agreed to purchase your Diamonds or Diamond Jewellery. If there is gold surrounding the diamonds, we will pay you for that too. Also please confirm if you want to be paid in £, €, or $.

7. If you are not happy with our offer, or we feel we are unable to purchase what you have sent to us, we will return your goods to you free of charge and insured.

8. If you have any queries with anything at all, please feel free to phone us on 0044 208 446 8538 or e mail us at

How will I know how much my diamonds worth?

Simply refer to our Diamond Calculator prices on the home page or call us on 0208 446 8538 for an instant quote.

What if I have a mixture of diamonds?

We will give you the individual prices for each diamond that we receive from you.

What happens if my diamond weight does not agree with yours?

We have specialist diamond scales and if there is any discrepancy on weight, we will notify you immediately before going any further.

How can I get my diamond to the HowCashForDiamonds?

We insist you send your diamonds to us in a sealed jiffy bag via Royal Mail Special Delivery. The starting insurance price is £250 cover. If your gold exceeds the above you can get cover for up to £2,500 per parcel from your Post Office. Once you have arranged your Special Delivery you can visit the Royal Mail Website here then enter your Code to track your parcel to ensure safe delivery.

How do I get the money for my diamonds?

Once we have agreed a price, we can
a) send a cheque, same day, first class post
b) credit the value to designated credit card of your choice. This will incur a 2.5% handling fee
c) make a BACS / TT transfer payment to any account that you require. There may will be a charge from your bank, which we will notify you before the transaction takes place.

How can I contact you?

a) Call us from 9am – 5pm on 0208 446 8538
b) E-mail us on
c) Fax us on 0208 369 5900
d) By letter to 48b Hendon Lane, Finchley, London N3 1TT
We deal with all e-mail and letters from you within 24 hours.

When are you Open?

Our business hours are: Monday to Friday / 9am to 5pm.
We are closed weekends and bank holidays.

How can I trust HowCashForDiamonds with my diamonds?

We are members of the:

British Jewellers' Association (BJA) - Membership No: 50659
National Association of Goldsmiths (NAG) - Member No: C0007252

How to sell a diamond

What our customers say

eventually discovered something which works well with my KIDNEY DISEASE 5 various home made remedies to revere KIDNEY DISEASE
Chester, Montford
Excellent from start to finish. The funds were in my bank account within two hours of receiving the valuation. Very highly recommended!
Mr A. Brown, Durham
your diamond valuation link is broken
Mr calum macdonald, aberdeen
I would strongly advise anyone who wishes to sell diamond jewellery to use this company..I was given a very efficient service and dealt with in an extremely fair and friendly manner. I will have no hesitation using them again. Many thanks.
Angela, Redcar
Excellent, efficient service. Staff were very polite and helpful.. Sent my diamonds last week and just woke up to my cheque in the post =) Prices are great also (I worked in a jewellers for 3 years) so instead of having €€ lying around in a jewellery box, get on it and get a price! Nothing to lose
Ms Louise C, Dublin, Ireland
Thank you for your very prompt and professional service. I sent my diamond by post on Wednesday and funds were in my account by Friday morning. Jonathan was helpful and reassuring. I would definitely recommend HCFD.
Mr Raymond Hughes, Inverness
Thank you for your quick response for my diamond valuation
Ms D B
Very polite staff, excellent service. Many thanks
dwingrave, Brighton
I couldn’t believe the care and attention you took in valuing my diamond. I was very impressed and your price was nearly double to everyone else.
Mr P Norman, Enfield
I sent you my platinum solitaire ring last night, and the money is already in my account. Brilliant service! Thank you
Mrs D Elton, Northampton
I was amazed to find in Finchley, North London a proper diamond buying business, all open, no secrets, total transparency and top price. Thank you Jonathan.
Mrs D Selton, Ware
the diamond ring I was left by my great aunt has paid for a whole new kitchen. Thank you Tom and Jonathan for your help and excellent price.
Mrs Norris, Bridlington
Without a doubt you guys know your business. Thank you for your time and knowledge and great price on my ex wife’s diamond ring.
Mr P Kellard, Wolverhampton
Absolutely fantastic service, would definately use this Company again
Ms Hetherington, Newcastle
Absolutely fabulous well pleased with offer staff are a pleasure to talk to.Second package is on the way thank you very much.
Ms janet mcbride, newtownards
Jonathan and his company were a total delight to deal with. Fast response to my query, prompt honest and great evaluation of my item. Money received same day as promised, totally recommend
Ms Teresa
Excellent, friendly service. No hesitation in recommending.
Mrs J, Warrington
I came up from Cornwall with my late mother’s single stone diamond ring – Brilliant Service … Thanks
Mrs D Chesney, Cornwall
Sold my pear shaped diamond, was very pleased with the offer and the service was excellent.
Mrs J S, London
The service was fantastic. very polite and everything was sorted out in a matter of days would definitely recommend and use again . Thankyou Karen
Mrs karen mcmillan, lancashire
I needed money, I drove from Preston to Jonathan & Tom with my 3.0ct round diamond. Was very pleased with the offer and the money was in my account same day.
Mrs P N H
I was left a in a Will a very large diamond, I went to visit Jonathan, in his office. He very carefully graded my diamond and offered more than a fair price,And a cup of tea !!!! Thanks. I can only recommend you to my friends and family.
Mr N T
Excellent Professional services, super quick payment, made the process simple highly recommend, very honest grading of diamonds!!
Mr m, highlands, scotland
In the business of diamonds The Only Person I can trust is Jonathan Williams. He is realistic & a wonderful person. I sent him 3.5 carat diamond. I got good offers from him & when I didn't agree to the offer. I got my diamond back within next day. Trusted in the field of business
Mrs Nusaiba, London
Great service from start to finish. Cash in my bank the same day. Thank you Julie
Ms Julie Orain, Neston Cheshire
Absolutely cannot fault this service! Jonathan was friendly and efficient. Posted my diamond and money was in my account the following afternoon. Would definitely recommend!
Mrs Briggs, Stockport
Very friendly and efficient. Sent out the diamond pack very quickly and I had a follow up call to ensure I received it and to explain what I had to do. After I sent my ring off it was only a couple of days before the quote was made which I was very happy with. Would definitely use them again. Thank you
Ms Hannah, Beds
I sold my diamond solitaire stud earrings, great service, and great price.
Mrs J P
Great price for my princess cut diamond ring and money was in my account same day. Thank you
Mr P
Very polite service, you made the sale of my solitaire ring quite painless.
Mrs J Hunt
Fantastic service efficient professional and recieved more than expected will Definately use again thankyou
Ms Mema, Lancashire
I found the service offered to be excellent, the staff - especially Jonathon- are extreme pleasant to deal and a pleasure to deal with. Very happy with the service and hope to have more dealings in the future - many thanks!
Ms Lisa B, Preston
Excellent service would reccomend
Mrs Susan, whitehaven
Just received the payment. Thanks for such a smooth process. I will be sure to recommend you to everyone I know. Thanks again.
Ross Clark, Perth
My fiancée and I finished our relationship a couple of months ago. By finding your website; and have sold you my 1.20 G/VS1 GIA diamond ring, I don’t feel so heartbroken now.
AR, Southampton
I had a diamond Tennis bracelet which I never wore. Thank you for such a great price.
DP, Harrow
You gave me double to what I had been offered for my 5.32 Emerald Cut diamond - Thank you so much.
RB, Liverpool
I found your site on Google, I think your service is unique; I was delighted with the price I got for my pear shaped diamond. I posted it by Royal Mail Special Delivery on Tuesday, and the money was in my account by Wednesday 12pm – under 24 hours – very impressed.
MF, Newbury
I was left a 2.30ct round diamond from an old aunt in her will, and I am absolutely gobsmacked at what you paid me when I came to your office, a big thank you Jonathan, your service was courteous, safe and friendly and very professional.
JR, Enfield
I think your site is amazing, I have used How Cash For Gold for 3 years, and saw your new site last week for selling diamonds. Your calculator is unique, and you gave me the prices quoted. I will definitely recommend you to my friends. I got £1500 for a diamond I had in the draw from my first husband, I will now spend that money with my new husband!!!
TG, Middlesbrough
Great company with great service. I found your site through google and within three days of finding the site i have got the the best price for my diamond and the cash paid into my account. Will definitely use your company again and will recommend you to everyone.
Mr s, armagh
Absolutely fantastic service, I would strongly recommend this service to anyone wanting to sell their Diamonds. The whole process was seamless from start to finish and I received my money the same day as I accepted the estimate, Thank you
Ms Colwell, Sunderland
Fantastic service! Sent my diamonds off in the post and received a phone call a couple of days later giving me a quote. Received the cash in my account the next day! A pleasure to deal with. Thanks again.
Mrs Angela Young, Farnborough, Hampshire
I used the calculator to get an estimate for my diamond ring (diamond price + platinum price). Sent my ring down on day 1, Jonathan called on day 2 (very polite and appropriately business-like), money in account day 3. Couldn't fault service. Found this company to be very trustworthy.
CL, Scotland
I would most definitely recommend this company if you would like a quick and easy sale. Cannot fault the service I received. Thank you.
Mrs Robertson, Scotland
I would most definitely recommend this company if you would like a quick and easy sale. Cannot fault the service I received. Thank you.
Mrs Robertson, Scotland
I enjoyed the visit and sincerely would give you highest recommendations to my friends.
G Foulkes, Essex
Thanks for a very prompt and hassle free service. Rapid one day turnaround from posting my item to receiving the cash in my bank account. Highly recommended!
Mr RE, London
Absolute fantastic service! Couldn't have asked for a more prompt response and the money was in my account the next day after the offer was made. Will definitely deal again and recommend to others, thank you.
Mrs D Crosby, York


If you’d like to leave us feedback, fill in a feedback form

Weekly diamond report

Read the latest news from the diamond industry.

HoWCashForDiamonds is a trading style of Jewellery Cave Ltd.

Registered in England No. 06616633.

Diamond buying Office :: Howcashfordiamonds, 48b Hendon Lane, Finchley, London N3 1TT

©2018 Jewellery Cave Ltd.

Powered by HeadChannel bespoke CMS

Terms and Conditions

  • is a company within Jewellery Cave Ltd and enables us to trade under the various brands we promote; Jewellery Cave Ltd is registered in England & Wales 6616633, whose registered address is 13 Station Road, Finchley, London N3 2SB

  • These Terms and Conditions shall be governed by the Laws of England and Wales and are the basis for the establishment of relations between "you" and "us".

  • Our provisional offer is based on your original description, on the assumption that the description provided is completely accurate, we value the goods in faith as falls within prevailing market rates and according to accepted industry standards.

  • Our provisional offer is not contractually binding.

  • Upon receiving your goods, it will be compared to your original online description to confirm they match.

  • By sending us your property you agree to us testing the diamonds.

  • If we find a variation in your original online description which affects the valuation of the offer, we reserve the right to adjust the offer either upwards or downwards, depending on our valuation compared with your original description.

  • Conditional offers are subject to contract, and are not legally binding until after we have physically inspected the items, confirmed to you verbally or by email, phone or written letter.

  • We will need to identify you, we only need copies NO ORIGINALS TO BE SENT, you will need to provide 1 proof of photo i.d. For example (Passport, Photo Driving Licence, or National Id Card). Also 1 proof of home address dated within the last 3 months for example. Please post copies in your Special Delivery Packet or you can scan and email them to, or fax the documents to fax number 0208 369 5900.

  • How Cash for Diamonds can provide basic packaging for your items which comprise an insert envelope and Royal Mail Special Delivery tamper proof bag. It is your responsibility to ensure that your items are securely and appropriately packaged, including the use of additional and/or item specific packaging. How Cash for Diamonds cannot be held responsible for damage to items sent in inappropriate packaging.

  • Our nominee to act as your shipping agent for your property is Royal Mail. The Royal Mail Special Delivery Service provides insurance cover for loss or damage to Your Property in transit, up to a market replacement value of £2,500.00. If you think the market replacement value of your goods is more than £2,500.00, it is your sole responsibility to take out additional insurance for that part of the market replacement value which exceeds £2,500.00. If you choose to despatch goods of a replacement value exceeding £2,500.00 via the Royal Mail Special Delivery Service without arranging any additional insurance cover, you agree that you are doing so at your own risk, and that you will have no claim on us and/or the Royal mail for any amount exceeding £2,500.00 of the replacement value of any goods lost, damaged or devalued in any way in the course of The Royal Mail Special Delivery Service. See special delivery page

  • You agree that we (How Cash For Diamonds) are not liable in any way if Royal Mail refuses any insurance claims in relation to Your Property.

  • While we will provide you with information that we have to help you in any dispute or claim that you may have with your shipping agent, we cannot be held liable for any failure in the shipping agents performance or of its obligations to you. Under the Data Protection act we will not have access to your claim against the shipping agent and we cannot act on your behalf in any part of the claim or dispute with the shipping agent.

  • It is your responsibility to obtain and retain the receipt for proof of postage and unique tracking number from the Post Office when sending your items to us, see / special delivery page.
Privacy policy

How we use cookies on this website

We use cookies and similar tools across our website to improve its performance and enhance your user experience. This policy explains how we do that.

What are cookies?

Cookies are small text files which a website may put on your computer or mobile device when you first visit a site or page. The cookie will help the website, or another website, to recognise your device the next time you visit. Web beacons or other similar files can also do the same thing. We use the term "cookies" in this policy to refer to all files that collect information in this way.

There are many functions cookies serve. For example, they can help us to remember your username and preferences or analyse how well our website is performing.

Certain cookies contain personal information – for example, if you click to "remember me" when logging in, a cookie will store your username. Our cookies won't collect information that identifies you, and will instead collect more general information such as how users arrive at and use our website, or a user's general location.

What sort of cookies do we use?

Generally, our cookies perform up to three different functions:

1. Essential cookies

Some cookies are essential for the operation of our website. For example, some cookies allow us to identify registered users and ensure they can access their own private pages. If a registered user opts to disable these cookies, the user will not be able to access all of the content that a registration entitles them to.

2. Performance Cookies

We utilise other cookies to analyse how our visitors use our websites and to monitor website performance. This allows us to provide a high quality experience by customising our offering and quickly identifying and fixing any issues that arise. For example, we might use performance cookies to keep track of which pages are most popular, which method of linking between pages is most effective, and to determine why some pages are receiving error messages.

3. Functionality Cookies

We use functionality cookies to allow us to remember your preferences. For example, cookies save you the trouble of typing in your username every time you access the site.

We also use functionality cookies to provide you with enhanced services such as allowing you to watch a video online or add comments.

We also use or allow third parties to serve cookies that fall into the three categories above. For example, like many companies, we use Google Analytics to help us monitor our website traffic. We may also use third party cookies to help us with market research, revenue tracking, improving site functionality and monitoring compliance with our terms and conditions and copyright policy.

Can a website user block cookies?

As we've explained above, cookies help you to get the most out of our websites.

However, if you do wish to disable our cookies then please follow the instructions in the help section of your preferred browser.

Please remember that if you do choose to disable cookies, you may find that certain sections of our website do not work properly.